colspan attribute

Type:number
Inherited:no
Used By:td
See:rowspan

The colspan attribute can be set to cause a single table cell to span more than one column. It's use is identical to HTML.

The second row consists of one cell which is as wide as the whole table

<table>
  <tr>
    <td>Column 1</td>
    <td>Column 1</td>
  </tr><tr>
    <td colspan="2">Both Columns</td>
  </tr>
</table>